350-501 MPLS and Segment Routing Practice Question
When configuring an MPLS-TE tunnel with affinity/constraint-based routing, what is the effect of assigning a link attribute of 'red' and setting the tunnel's affinity to include 'red' with the 'include-all' keyword?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The tunnel must use only links that have the 'red' attribute.
The 'include-all' affinity means the tunnel path must include all links that have the specified color attribute. If a link does not have 'red' attribute, it is excluded from the CSPF computation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The tunnel will prefer links with 'red' but may use others if necessary.
Why it's wrong here
That would be 'include-any'.
- ✗
The tunnel will use a strict explicit path.
Why it's wrong here
Affinity is separate from explicit path.
- ✗
The tunnel will avoid links with 'red'.
Why it's wrong here
That is exclude.
- ✓
The tunnel must use only links that have the 'red' attribute.
Why this is correct
Correct: 'include-all' requires all links to have the attribute.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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